(Very) Hard AND nice puzzles
The following list contains portal puzzles that have been rated as nice or very nice and that are difficult. These puzzles are recommended for experts - and allow some time to solve.
| Description | solved | Rating | |
|---|---|---|---|
 | Two Face [Arrow Renban GW Sudoku] by Christounet (on 29. December 2025, 23:19) | 68 |  97 % |
| 24 Rätsel in 24 Stunden (Teil 3) - Höhle by Zzzyxas (on 24. June 2017, 02:24) | 85 | 93 % |
| Starmie (Masyu-Star Battle Hybrid) by MaizeGator (on 18. February 2025, 03:12) | 84 | 96 % |
| 3 Snakes 2 Puzzles by the_cogito (on 19. June 2022, 18:41) | 52 | 93 % |
| LM 2018 Countdown: A 38 (1) by tuace (on 2. June 2018, 09:06) | 43 | 95 % |
| Entropic Paradox by XeonRisq (on 1. February 2023, 15:00) | 42 | 94 % |
| Absolute Zero by juggler (on 8. March 2024, 08:24) | 47 | 94 % |
| Battlefield Sudoku #4: Knights! by Big Tiger (on 23. June 2020, 04:08) | 28 | 97 % |
| Prime whispers sudoku (aka "Prime line sudoku") by ibn Muhyiddin (on 4. July 2020, 16:32) | 59 | 96 % |
| Dropsies by RockyRoer (on 12. September 2020, 12:01) | 90 | 97 % |
| Overlapping Notes (Double digit thermometer sudoku) by Aspartagcus (on 28. August 2021, 21:13) | 29 | 98 % |
| Patchwork by steelwool (on 11. October 2022, 18:00) | 29 | 94 % |
| SINIS by ICHTUES (on 16. October 2022, 06:00) | 34 | 96 % |
| Waterworld by Palfly Kampling (on 16. June 2023, 02:37) | 29 | 92 % |
| Loop Compass by Agent (on 9. April 2024, 09:00) | 58 | 100 % |
| One Loop, Two Loop by Belamis (on 21. July 2024, 11:48) | 38 | 96 % |
| Ringban Octopus by ThePedallingPianist (on 22. August 2024, 14:23) | 30 | 94 % |
| AY-KI-YA (chaos construction) by Killer Joe (on 8. November 2025, 03:40) | 33 | 93 % |
| Meta Occulta (JeremyDover Collab) by Crusader175 (on 9. February 2026, 15:30) | 29 | 99 % |
| Whirlwind by SamuPiano (on 2. January 2024, 22:00) | 61 | 98 % |
